There are 11 pens in a box : 5 pens are red , 4 pens are blue and 2 pens are green. One pen is selected at random from the box. What is the probability that pen is green?

Two corresponding sides of two similar triangles are 3cm and 5cm. the area of the first triangle is 12cm^2. what is the area of the second triangle?

What is the area of the shaded sector?

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking